After the oil and alkaline water are mixed, it is necessary to start stirring. At this time, the process of oil emulsification is accelerated through the stirring rod, so that each molecule collides with the other and breaks up again. Therefore, the degree of stirring directly affects the quality of the saponification reaction.

The uniformity of mixing also has a great relationship with the overall saponification reaction. If the mixing is not uniform, the saponification degree of the material may be uneven, resulting in different saponification degrees of the soap body, thus affecting the quality of the soap. Incomplete mixing or uneven mixing means that only part of the soap solution is thick when the whole soap solution is stirred, but all the soap solutions are not completely uniform, that is, the oil and alkali solution is not completely mixed.

First of all, let's talk about the uneven mixing range: for example, using a soap stirring artifact to stir the soap liquid, although the mixing speed is very fast, if the mixer is fixed at a fixed point, the mixing rod of the mixer will drive the flow of the soap liquid, but the mixing range is only a certain area of a pot of soap liquid; After stirring for a while, you will see that the soap liquid seems to be beginning to thicken.

At this time, if you stop the mixer and use a hand-held mixing rod to stir the whole pot of soap liquid several times, you will find that the consistency of the whole soap liquid has decreased. This is because the scope of mixing by the mixer should be saponified more quickly, so the soap liquid looks thicker. For the rest parts that are not noticed, the chance of soap liquid molecule collision is reduced, As a result, the saponification reaction is slow but not thick. When you use a hand-held stirring rod to stir the whole soap solution several times and mix the not yet thick soap solution with the thick soap solution, you will find that the whole soap solution is not so thick.

If the soap solution is poured into the soap mold without stirring the whole soap solution evenly again because the soap solution that is stirred by the motor starts to thicken, the manual soap is formed by pouring the soap solution made in the same pot into different soap molds will often be produced, and there will be obvious differences in the saponification degree due to the uneven thickness of the soap solution, that is, some soaps are in good condition after demoulding, and some are in bad condition, It may even produce the so-called sponge cake-like "Sponge Cake Soap", the sticking mold will not come out, or the oil-water separation.

Uneven mixing of soap body will "over alkali" in some parts and "over oil" in other parts. This free alkali and free fatty acid can not only bring irritation to human skin but also cause rapid rancidity of soap. Even if you use the test paper to test the pH value, it will not be accurate.

Therefore, when it is found that the range of soap liquid stirred by the mixer begins to be thick, the mixer should be stopped first, and then the whole soap liquid should be thoroughly stirred by manual mixing, and then we can see whether the whole soap liquid is still thick after manual mixing. If so, we can decide whether we are ready to enter the mold. However, if it is unable to reach the consistency before casting, it can be mixed with a mixer according to the situation, or it can be reached by manual mixing, and then it can be ready to be poured into the soap mold.

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